qemu: domain: Allow forcing images to read-write in qemuDomainStorageSourceAccessAllow
qemu: domain: Allow forcing images to read-write in qemuDomainStorageSourceAccessAllow

In commit 76b9aba2ba6 I refactored how the function treats the readonly
flag which introduced a bug when we'd not allow to force read-write
state for an image.

This created problems with blockjobs where we need to temporarily
force images to have read-write permissions.

Rename QEMU_DOMAIN_STORAGE_SOURCE_ACCESS_READ_ONLY to
QEMU_DOMAIN_STORAGE_SOURCE_ACCESS_FORCE_READ_ONLY and also introduce
a complement QEMU_DOMAIN_STORAGE_SOURCE_ACCESS_FORCE_READ_WRITE which
will allow to force write access.

https://bugzilla.redhat.com/show_bug.cgi?id=1717768

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

jardasgit/libvirt,eskultety/libvirt,jfehlig/libvirt,olafhering/libvirt,nertpinx/libvirt,andreabolognani/libvirt,crobinso/libvirt,eskultety/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,zippy2/libvirt,andreabolognani/libvirt,jardasgit/libvirt,olafhering/libvirt,libvirt/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,libvirt/libvirt,andreabolognani/libvirt,olafhering/libvirt,libvirt/libvirt,crobinso/libvirt,libvirt/libvirt,jfehlig/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,nertpinx/libvirt,crobinso/libvirt,jfehlig/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,eskultety/libvirt,fabianfreyer/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,eskultety/libvirt,fabianfreyer/libvirt,eskultety/libvirt,nertpinx/libvirt,zippy2/libvirt,jardasgit/libvirt,nertpinx/libvirt